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From "Nikolay Izhikov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-5714) Implementation of suspend/resume for pessimistic transactions
Date Fri, 29 Mar 2019 16:33:06 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-5714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16805181#comment-16805181

Nikolay Izhikov commented on IGNITE-5714:

Hello, [~agoncharuk]

Thanks for the update.

If [~Alexey Kuznetsov] don't mind I take care of this ticket. 


> Implementation of suspend/resume for pessimistic transactions
> -------------------------------------------------------------
>                 Key: IGNITE-5714
>                 URL: https://issues.apache.org/jira/browse/IGNITE-5714
>             Project: Ignite
>          Issue Type: Sub-task
>          Components: general
>            Reporter: Alexey Kuznetsov
>            Assignee: Alexey Kuznetsov
>            Priority: Major
> Support transaction suspend()\resume() operations for pessimistic transactions. Resume
can be called in another thread.
>    _+But there is a problem+_: Imagine, we started pessimistic transaction in thread
T1 and then perform put operation, which leads to sending GridDistributedLockRequest to another
node. Lock request contains thread id of the transaction. Then we call suspend, resume in
another thread and we also must send messages to other nodes to change thread id. 
> It seems complicated task.It’s better to get rid of sending thread id to the nodes.
> We can use transaction xid on other nodes instead of thread id. Xid is sent to nodes
in GridDistributedLockRequest#nearXidVer
>    _+Proposed solution+_ : On remote nodes instead of thread id of near transaction GridDistributedLockRequest#threadId
use its xid GridDistributedLockRequest#nearXidVer.
> Remove usages of near transaction's thread id on remote nodes.

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